Tire alarm



Patented Jetty 22, i924-,

UNITED WILLIAM KNUTSON, OF FORT SIIAW, MONTANA. 4, I;

i TIRE ALARM.

Application filed May 21,

T all whom it may concern.'

Be it known that I, WILLIAM KNUTsoN, a

, citizen of the United States, residing at falls below a predeterminedpoint and thereby effectively warning the driver of the vehicle that histire needs attention.

.'Another prime object ofthe invention is the provision of an audiblesignal for giving warning to the driverl ofr the vehicle when pressureinthe tires falls below a predetermined point, whereby ,the necessaryvattention can be given thereto, thereby effectively saving the tiresfrom rim cuts, stone bruises and the like.

f A/further prime object of the invention is the provision of anovelattachment for association with the ordinary air valve of'apneumatic tire embodying means ffor per mitting the escape of the airfrom the tire when the pressure in the tire'falls -below a predeterminedpoint and to provide a whistle disposed in the path of the escaping air,whereby a signal will be given. j

A still further; objectof theinvention is to provide a tire alarm of theabove character, which will be durable and eiiicient in use, one thatwill be simple and easy to manufacture and one which can be readilyassociated with a vehicle wheel and tire at a minimum cost.

With these and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts, as will behereinafter more specifically described, claimed and illustrated in theaccompanying drawings, in which drawings:

Figure 1 is a side elevation of the improved tire alarm, and

Figure 2 is a longitudinal section through the same.

Referring to the drawings in detail, wherein similar referencecharacters designate" corresponding parts throughout the several views,the letter A generally indii923.4 serial No'. 640,614.

cates the improved tire alarm and ordinary tire lling valve.,V Asfshown` the tire filling air valve B comprises the ordi-,:

nary casing 5, through whichggprojects the,` ordinaryrvalve stem 6. Asisv common, the valve stein 6 can be depressed.forunseating` the valveof the tire filling valve Bfor per-r mitting the, escape of air from thetire. i .j

The kimproved attachment A, comprises a cylindrical body 1O1-which` ispreferably,

threaded `internally throughout its length as,

at 11` The extreme inner end of the bodyi" 10 is provided with arestrictedneck `por-:Y

tion 12, which is adapted .to bethreaded ong;

the outer end, of the ordinary tire filling valve B.k As shown theoute'r surface of the,

j 1,502,039*l PATENTv OFFICE.

restricted neckportion12 is provided with external threads 13 forl thereception lof a. protecting cap 14 which is adaptedt'o-house@ all oftheparts of the attachment. Thisprofr tecting dust cap 14 will behereinafterrmorel. fully described. Inorder to form a fluid,- tightjoint between the neck 12 j and the, body 5 of the ordinary air fillingtire valveg B I provide a rubber gasket 15 which is dis-. posed betweenthe inner end of lthe neck and a shoulder formed on the saidbody 5, i,

A circular plate 16 is disposed within the body V10 and rests upon a'shoulder 17l formed by the restricted neck-12Jand`this,v

plate 16 is adapted to engage the outer end; I

throughfjthefplate 16 Suitable air, escape'.

openings 18 are formed inthe same. Aty a point intermediate the ends ofthe body 10 I provide a valve seat 19 which is externally threaded topermit the ready positioning thereof in the said body. Adapted to t uponthe valve seat 19 I provide a frustoconical shaped valve head 2O whichis provided with a disk-shaped plate 21 having air escape openings 22therein. This valve 2O is normally held upon its seat by the airpressure from the tire and in order to insure the normal seating thereofI provide an eX- pansion coil spring 23 which engages the base plate 21ofthe valve 20 and the supporti/ng plate 16. In order to prevent turningof the valve and the base plate 21 I pro-` vide raised tits 211 whichare adapted to fit. in depressions 25 formed on the inner surface'of thevalve seat 19.

Disposed adjacent the outer end of the off the valve 20. This plate 28is provided with air escape openings 30. A relatively heavy expansionspring 3l is disposed between the plate 26V4 and the plate 28 and isadapted to unseat the valve 20 against the f 'tension 'of the spring 23when the pressure in they vtire falls 'below al predetermined point. Theext-renie outer end or the body l0 carries a supporting plate 3l whichadjustably carries a threaded stem 32. This stem 32 can be threaded intoand out of the body L10 and serves as means for `indicating the-positionof the plate 2G. As stated, by adjusting the plate 26, the tension ofthe spring can be adjust-ed and by turning the vstem -32 into engagementwith the plate the pressure at which the valve will be unseated can bedetermined. .This is accomplished through the medium of a graduatedscale 33 on the said stem. The stem 32 can be held in an adjustedposition by means of a holding nut 34 if rso desired.

The whistle'is lcarried `by the. outer end of the body :and the stem 32for-ms a part there-- of and supports the dome 35 of the said whistle.As' shown the dome is provided with a cross strap V36 which engages thestem. It yis obvious that when the pressure in the valve falls below apredetermined point that the spring 31 being stronger than the spring 23will overcome the tension thereofandjthe existing pressure acting on thevalve and thus vbring about the `efl'ectively give an alarm.

As clearly shown in Figure 1, the protecting cover 14 is provided withscreen covered openings l/l, which permit the escape of the air fromthe. Cover.

From the foregoing description it can be seen ythat I have provided anexceptionallyv simple and compact attachment for vehicle tires whichwill elfectively give an ala-rm7 when the pressure in the tires fallsbelow a predetermined point.

Changes in details may be made providing the same do not depart from thespirit or scope of the invention, as set forth in the annexed claim.

What I claim as new is:

The combination with an ordinary tire air filling valve including a bodyand a valve stem, of an attachment therefor includingl a body arrangedto receive the outer end of the air valve filling body, a valve seatadjustably oarried by the body of the attachment, a normally closedvalve carried by the body ol the attachment for litting upon the seat,an adjustable plate threaded into the body of the attachment opposite ofsaid valve seat, a spring engaging said adjustable plate for unseatingthe valve when the pressure in the air lilling tire valve falls below apredetermined value, means for indicating the`position of saidadjustable platej and la whistle carried by said means adapted to'besounded by the escape of air through said valve body.

In testimony whereof I alliX my signature in presence of two witnesses.

WILLIAM KNUTSON,

Witnesses J. THoRUD, FRANK J. HIRSHBERG.

